Abstract—The size and the isolation of filters impact directly the whole front-end system integration and performance. The miniaturization and high-isolation of filters is always a hot spot of research. In this paper, a compact high-isolation band-pass filter is designed based on the dual mode short-ended resonator. The technique of the stepped-impedance lines can adjust the stop-band width by the length and width of the lines. In the designing process, the length of the feeders computed in an easy and effective way is given to provide the estimated value. The capacitive source-load coupling provides four transmission zeros to enhance the selectivity. The area of this filter, of which the chamfer micro-strips are used to decrease the size, is only 36.7% of the traditional ones. In addition, the characteristics of this filter are analyzed, from which the design graph is given and the measured results match well with the simulations.

Index Terms—Dual-mode filter, short-ended, compact, stepped- impedance lines.

The authors are with the Institute of Electronics, Chinese Academy of Sciences, Beijing, China. And they are also with the Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, Beijing, China.

Cite:Xue Bing, Ji Yicai, "Compact Wide Stop-Band Dual-Mode Filter with Four Transmission Zeros," International Journal of Computer and Electrical Engineering vol. 8, no. 3, pp. 234-240, 2016.